Single-particle gap above the Verwey transition in Fe{sub 3}O{sub 4}
- Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109 (United States)
- Department of Physics, Purdue University, W. Lafayette, Indiana 47907 (United States)
- Bell Laboratories, Lucent Technology, Murray Hill, New Jersey 07974 (United States)
The Verwey transition in magnetite, Fe{sub 3}O{sub 4}, has been studied using temperature-dependent high-resolution photoemission spectroscopy. On heating through the transition temperature T{sub V} the band gap is not collapsed, but is merely reduced by {approximately}50meV, showing that a metal-insulator transition does not occur. The change in the gap is perfectly consistent with the two orders of magnitude conductivity jump at T{sub V}. Thus even above T{sub V} short-range charge ordering rather than site equivalency dominates the single-particle excitations and the electrical properties. We also point out important implications for efforts to model the electrical transport above T{sub V}. {copyright} {ital 1997} {ital The American Physical Society}
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- DOE Contract Number:
- AC02-76CH00016; FG02-90ER45416
- OSTI ID:
- 565333
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 55, Issue 19; Other Information: PBD: May 1997
- Country of Publication:
- United States
- Language:
- English
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